how to use a binary mask as a "stencil" for a grayscale image?

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Naim
Naim 2017-6-22
评论： Naim 2017-6-22
Hey everyone,
I have a binary mask (first attached image) that I want to use to trace-out the image of a gray-scale picture (second attacked image) and create another image in that manner.
I tried the simple AND operation, but the newly created image is a binary, not grayscale. I want to use the mask to crop out the image, without changing anything else.
Thanks in advance for any tips!

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Image Analyst
Image Analyst 2017-6-22
Simply use the inverse of the mask to set those pixels to zero.
imageCopy = grayImage; % Make a copy so you don't destroy the original.
imageCopy(~mask) = 0; % Set black areas to black, leaving gray areas intact.

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